Lifting jack



June 2, 1931.

A. c. HOPKINS 1,807,914

LIFTING JACK Filed May 18, 1927 INVENTOR Patented June; 1931 UNITED STATES PATENT OFFICE ARTHUR C. HOPKINS, OF

NILES, MICHIGAN, ASSIGNOR TO NATIONAL-STANDARD OOH- PANY, OF NILES, MICHIGAN LIFTING JACK .Application filed ma 18,

The main object of this invention is to provide an improved lifting jack having a standard made up of telescoping sections which is very compact when collapsed and at the same time one which has a considerable lift when fully extended.

A further object is to provide an improved lifting jack having these advantages which is easy to operate and strong 221d durable 10' in use.

Objects relating to details and economies of my invention will appear from the description to follow. The invention is defined in the claims.

A structure embodying the features of my invention is clearly illustrated in the accompanying drawings, in which:

Fig. 1 is a side view of my improved jack collapsed, the actuating screw being partially broken away.

Fig. 2 is a detail view mainly in vertical central section on line, 22 of Fig. 3.

Fig. 3 is a fragmentary view partially in section on line 3-3 of Figs. 1 and 2.

Fig. 4 is a fragmentary section of a modified form'or embodiment of my invention.

The embodiment of the structure illustrated comprises a base 1 on which the hollow standard 2 is mounted, the standard havsoing'laterally projecting ears 3 at its lower end secured to the standard by means of the rivets 4. At its upper end the standard has an inturned flange 5. Y

The base is provided with an arm-like extension 6 having a way therein comprising a central cylindrical bore-like portion 7 and opposed groove-like or channel portions 8 opening to the central section 7. This way is curved at its inner end and opens upwardly to the lower end of the standard. The standard has groove-like ways 9 therein registering with the ways or channels 8 of the base and its aim extension.

The lifting member is made up of a tubular outer or bottom section 10 and a top or inner section 11 telescoping within the bottom section, the top section having a head 12. The bore 13 of the outer or bottom lifting member section corresponds in diameter to the borelike portion 7 of the way in the base so that 1927. Serial No. 192,267.

compactness when disassembled and conven- I ience in assembling.

The power is transmitted from the screw to the hfting member by means of a series of spherical thrust members 20 and a series of elongated thrust members 21, these members being in the preferred embodiment of a general H-shape. The thrust members 20 are adapted to travel in the way or bore 7 and to enter the lifting member section 10 when it is collapsed within the standard. The thrust members 21 extend across the bore 7 engaging and, traveling in the grooves 8. This H-shape permits the thrust members 21 to swing around the groove at the inner end of the bore 7.

A bearing ball 22 is preferably disposed between the inner end of the screw and the adjacent thrust member 21. The outer end ofthe arm is spun in at 23 to retain the thrust members when the screw is removed.

In the modification shown in Fig. 4 cylindrical thrust members 24 are substituted for the thrust members 21, these thru t members 24 being connected by cables 25 arranged through the ends thereof to prevent their getting out of parallel relation or becoming wedged in the ways.

With the parts thus arranged the power from the screw is effectively transmitted to the lifting member, there being, in effect, a flexible power transmitting means. These thrust members are arranged so that they are maintained in alinement and cannot become wedged or locked.

I have illustrated and described my invention in an embodiment which I regard as very practical. I have not attempted to illustrate or describe other adaptations or modifications as it is believed this disclosure will enable those skilled in the art to embody or adapt the same as ma be desired.

Having thus descri (1 my invention what I claim as new and desire to secure by Letters Patent is:

1. In a lifting jack, the combination with a standard having a longitudinal bore therein and provided with a base having a laterally rojecting arm, said base and arm having a Bore therein upwardly curved at its inner end and opening to the bore of said standard, said base, arm and standard having opposed longitudinal groove-like guide ways therein opening to their said bores, a lifting member comprising inner and outer telescoping sections, the outer section having telescoping engagement with said standard, the bore of the outer section opening to the bore of said standard and corresponding in diameter to that of said base and arm, an actuating screw, a coacting nut removably engageable with the outer end of said arm, a plurality of H-shaped thrust members disposed with their ends in said guide ways, a thrust ball disposed between the inner end of said screw and the said thrust members, and a plurality of thrust balls disposed to travel in said bores between the said H-shaped thrust members and said inner lifting member section and coacting with the lower end thereof, said balls being adapted to enter the outer lifting member section as the inner section is projected therefrom. a

2. In alifting jack, the combination with a standard having a longitudinal bore therein and provided with a base having a laterally projecting arm, said base and arm having a ore therein upwardly curved at its inner end and opening to the bore of said standard, said base, arm and standard having opposed longitudinal groove-like guide ways therein opening to their said bores, a lifting member comprosing inner and outer telescoping sections, the outer section having telescoping engagement with said standard, the bore of the outer section openin to the bore of said standard and correspon g in diameter to that of said base and arm, an actuating screw, a coacting nut removably engageable with the outer end of said arm, a plurality of thrust members disposed with their ends in said guide ways, an a plurality of thrust balls disposed to travel in said bores between the said first mentioned thrust members and said inner lifting member section and coacting with the lower end thereof, said balls being adapted to enter the outer lifting member section as the inner section-is projected therefrom.

3. In a lifting jack, the combination with a standard having a longitudinal bore therein and providedwith a base having a laterallyprojecting arm, said base and arm having a bore therein upwardly curved at its inner end and opening tothe bore of said standard,

said base, arm and standard having opposed longitudinal groove-like guideways therein opening to their said bores, a lifting member comprising inner and outer telescoping sections, the outer section having telescoping engagement with said standard, the bore of the outer section opening to the bore of said standard and corresponding in diameter to that of said base and arm, a series of H- shaped thrust members disposed with their ends in said guide ways, a series of thrust balls disposed to travel in said bores between the said H-shaped thrust members and said inner lifting member section and coasting with the lower end thereof, said balls being adapted to enter the outer lifting member section as the inner section is projected therefrom, and an actuating screw for projecting into said arm.

4. In a lifting jack, the combination with a standard having a longitudinal bore therein and provided with a base having a laterally projecting arm, said base and arm having a bore therein upwardly curved at its inner end and opening to the bore of said standard, said base, arm and standard having opposed longitudinal groove-like guide ways therein opening to their said bores, a lifting member comprising inner and outer telescoping sections, the outer section having telescoping engagement with said standard, the bore of the outer section opening to the bore of said standard and corresponding in diameter to that of said base and arm, a series of thrust members disposed with their ends in said guide ways, a series of thrust balls disposed to travel in said bores between the said first mentioned series of thrust members and said inner lifting member section and coacting with the, lower end thereof, said balls being adapted to enter the outer lifting member section asthe inner section is projected therefrom, and an actuating screw projecting into said arm.

5. In a lifting jack, the combination with a standard provided with a base, a lifting member comprising sections telescopingly associated with each other and with said standard, said base, standard and outer section of said lifting member being provided with communicating ways of cylindrical cross section, the ways of the outer section of the lifting member and base being of corresponding diameter and being positioned end to end when the outer section is collapsed within the standard, the base and standard having opposed channel guide ways therein opening to their said cylindrical guide ways, an actuating screw mounted on said base to be projecte into and retracted from its said glide way, a series of spherical thrust memrs traveling in and ded by said cylindrical guide ways and a apted to enter the said outer liftin member section to coact with the inner Iii rality of elongated thrust members extending across said cylindrical guide way into said channel guide Ways and interposed between said spherical thrust members and said actuating member.

6. In a lifting jack, the combination of a standard provided with a base, a lifting member comprising telescoping sections telescopingly associated with said standard, said base and standard having communicating ways comprising a central portion and channel side portions opening thereto, a series of thrust members traveling in the central portion of said ways and adapted to enter the outer lifting member section when the outer section is collapsed within the standard, a second series of thrust members adapted to travel in and supported by the channel side portion of said guideway, and an actuating screw coacting with the second series of thrust members.

7. In a lifting jack, the combination of a standard provided with a base, a lifting member comprising sections telescopingly associated with each other and with said standard, said base and standard being provided with a way having opposed channel-like side portions and an enlarged central portion, a series of thrust members traveling in and guided by said central portion of said way and adapted to enter the outer lifting member section to coact with the inner lifting member section, a series of elongated thrust members traveling in said channel-like portions of said ways. and an actuating means coacting with said thrust members.

8. In a lifting jack, the combination with a standard, a lifting member comprising sections telescopingly associated with each other and with said standard, a series of spherical thrust members adapted to enter the outer lifting member section to coact with the inner section, said standard being provided with opposed channel-like thrust member guide ways, thrust members traveling in said guide ways to coact with said spherical thrust members, an actuating screw, and a guide way into which said thrust members may retract when the lifting member is collapsed.

9. In a lifting jack, the combination of a standard, a lifting member comprising sections telescopingly associated with each other and with said standard, said standard being provided with opposed groove-like ways, a series of thrust members adapted to enter the outer lifting member section to engage the inner lifting member section when the outer section is in collapsed position within said standard, a second series of thrust members traveling in said ways to project said outer lifting member from said standard, and an actuating screw coacting with said thrust members.

10. In a lifting jack, the combination of a standard, a lifting member comprising sections telescopingly associated with each other and with said standard, said standard being provided with opposed groove-like Ways, a series of thrust members adapted to enter the outer lifting member section to en'- gage the inner lifting member section when the outer section is in collapsed position within said standard, a second series of thrust members traveling in said ways to project said outer lifting member from said standard, and an actuating means coact-ing with said thrust members.

11. A standard, a lifting member in the standard and comprising two telescoping parts, a series of thrust members adapted to enter one of the said telescoping parts to extend the other therefrom, a second series of thrust members in line with the first series and adapted to enter the standard to project the lifting member therefrom, means for holding said second series of thrust members in alignment in the standard, and actuating means for moving said thrust members to extend the lifting member and project the same from the standard.

12. A standard, a lifting member in the standard and comprising two telescoping parts, a series of thrust members adapted to enter one of the said telescoping parts to extend the other therefrom, a second series of thrust members in line with the first series and adapted to enter.the standard to project the lifting member therefrom, means for holding said second series of thrust members in alignment in the standard including guides in the standard and cooperating parts on the thrust members engaging such guides, and actuating means for moving said thrust members to extend the lifting member and project the same from the standard.

13. A standard, a lifting member in the standard and comprising two telescoping parts, a series of thrust members adapted to enter one of the said telescoping parts to extend the other therefrom, a second series of thrust members in line with the first series and adapted to enter the standard to project the lifting member therefrom, means for holding said second series of thrust members in alignment in the standard, and actuating means for moving said thrust members to extend the lifting member and project the same from the standard. including a case and a screw therein adapted to be urged against the end of the thrust members, the case being adapted to receive the thrust members when the screw is retracted.

14. A standard, a lifting member in the standard and comprising two telescoping parts, a series of thrust members adapted to enter one of the said telescoping parts to extend the other therefrom, a second series of thrust members in line with the first series and adaptedto enter the standard to project the lifting member therefrom, means for holding said second series of thrust members in alignment in the standard, actuating means for moving said thrust members. to extend the lifting member and project the same from the standard includmg a case and a screw therein adapted to be urged a ainst' the end of the thrust members, the case eing adapted to receive the thrust members when the screw is retracted, and means to hold the thrust members in alignment in the case.

15. A lifting jack comprising a standard having a bore, a thrust member receiving extension having a bore communica'tin with the lower end of the bore of the stan ard, a series of thrust members in said extension, means for forcing said thrust members from said extension into the bore of the standard, a lifting member comprising telescoping sections telescoping in the bore of the standard and adapted to be elevated by said thrust members, and means within said standard with which a plurality of said thrust members may engage for retaining said thrust members in Vertical alignment within the standard for elevating said lifting member, I

the outer lifting member being adapted to receive a series of thrust members projected and supported by the series engaged in said aligning means.

16. A jack comprising a standard having a bore, a thrust member receiving extension havin a bore communicating with the lower end 0 the bore of the standard, a series of thrust members lying in said extension, means for forcing said thrust members from said extension into the bore of the standard, a lifting member comprising telescoping sections telescoping in the bore of the standard, and means within the standard with which a plurality of thrust members coact for aligning them within the standard for projecting the liftin member, the outer. liftin member being a apted to receive a secon series of thrust members. projected by the first whereby the inner lifting member is projected from the outer.

In Witness whereof I have hereunto set In hand.

y ARTHUR C. HOPKINS. 

